Subcommittee D30.05 on Structural Test Methods, part of ASTM International Committee D30 on Composite Materials, has been standardizing a series of methods that are related to the analysis and substantiation of mechanically fastened joints composed of composite materials.

The latest in this series of standards, D 7332/D 7332M, Test Method for Measuring the Fastener Pull-Through Resistance of a Fiber-Reinforced Polymer Matrix Composite, is based upon procedures previously published in the Composite Materials Handbook (CMH-17), for which no standardized test methods have previously existed.

D 7332/D 7332M assesses the capability of a composite plate to resist force pulling a mechanical fastener through a plate (force is applied to the fastener perpendicular to the plane of the plate). Adam J. Sawicki, chair of Subcommittee D30.05 and Technical Fellow, Structures Technology, The Boeing Company, says that the standard will be used in the development of data to analyze and substantiate mechanically fastened joint designs in structures composed of composite materials. He says that the most important examples of this include materials that are subject to out-of-plane loadings such as bolted connections between the skin and substructure in a pressurized aircraft fuselage.

Sawicki says that Subcommittee D30.05 is seeking additional participation from the marine, automotive/ground vehicle and civil infrastructure industries to improve the applicability of D30.05 standards in those areas. He also notes that the subcommittee plans to expand the scope of D 7332 in future revisions to include pull-through testing of bolted attachments in sandwich structures.

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